Nitrogen line spectroscopy in O-stars:
Gespeichert in:
| 1. Verfasser: | |
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| Format: | Abschlussarbeit Elektronisch E-Book |
| Sprache: | English |
| Veröffentlicht: |
2012
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| Schlagworte: | |
| Online-Zugang: | kostenfrei http://d-nb.info/1027066267/34 https://nbn-resolving.org/urn:nbn:de:bvb:19-148998 Inhaltsverzeichnis |
| Beschreibung: | 220 S. graph. Darst. |
Internformat
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| 100 | 1 | |a Rivero González, Jorge Gustavo |e Verfasser |4 aut | |
| 245 | 1 | 0 | |a Nitrogen line spectroscopy in O-stars |c Jorge Gustavo Rivero González |
| 264 | 1 | |c 2012 | |
| 300 | |a 220 S. |b graph. Darst. | ||
| 336 | |b txt |2 rdacontent | ||
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Datensatz im Suchindex
| _version_ | 1804149981459775488 |
|---|---|
| adam_text | IMAGE 1
CONTENTS
CONTENTS VII
LIST OF FIGURES XIV
LIST OF TABLES XVI
ZUSAMMENFASSUNG XVII
ABSTRACT XIX
1 INTRODUCTION 1
1.1 MASSIVE STAR EVOLUTION 1
1.1.1 OVERVIEW 2
1.1.2 EVOLUTION WITH MASS LOSS AND ROTATION 6
1.2 MOTIVATION OF THIS THESIS 12
1.3 OVERVIEW OF THE CHAPTERS OF THIS THESIS 14
2 ATMOSPHERIC CODES 16
2.1 OVERVIEW 16
2.2 BASIC ASSUMPTIONS FOR MODELING STELLAR ATMOSPHERES O F HOT STARS 16
2.2.1 NON-LOCAL THERMODYNAMIC EQUILIBRIUM 17
2.2.2 STELLAR WINDS 19
2.2.3 LINE-BLOCKING/BLANKETING 20
2.3 A DESCRIPTION OF THE ATMOSPHERIC CODE FASTWIND 21
2.3.1 FASTWIND VIO.L 22
2.3.2 APPLICATION OF FASTWIND 23
3 MODEL ATOMS FOR NLTE LINE FORMATION COMPUTATIONS IN STELLAR
ATMOSPHERES - A NITROGEN MODEL ATOM 24
3.1 CONSTRUCTION O F A COMPREHENSIVE MODEL ATOM 24
3.1.1 MODEL ATOM STRUCTURE 24
3.1.2 INPUT ATOMIC DATA 25
3.2 THE NITROGEN MODEL ATOM - IMPLEMENTATION INTO FASTWIND 29
3.2.1 N I L MODEL ION 29
3.2.2 N ILL MODEL ION 30
3.2.3 N IV MODEL ION 34
HTTP://D-NB.INFO/1028302649
IMAGE 2
VIII CONTENTS
3.2.4 N V MODEL ION 35
3.3 DIAGNOSTIC NITROGEN LINES IN THE OPTICAL 37
4 NITROGEN III EMISSION LINE FORMATION REVISITED 41
4.1 INTRODUCTION 42
4.2 N III EMISSION LINES FROM O -STARS - STATUS QUO 44
4.3 DIELECTRONIC RECOMBINATION 46
4.3.1 THE N III EMISSION TRIPLET AT K A4634-4640-4642 46
4.3.2 IMPLEMENTATION INTO FASTWIND 46
4.3.3 IMPLICIT VS. EXPLICIT METHOD 51
4.4 N III (EMISSION) LINE FORMATION 53
4.4.1 COMPARISON WITH THE RESULTS FROM MH 53
4.4.2 MODELS WITH FULL LINE-BLANKETING 56
4.4.3 THE IMPACT O F WIND EFFECTS 60
4.5 COMPARISON WITH RESULTS FROM CMFGEN 62
4.6 COUPLING WITH O III 64
4.7 INFLUENCE OF VARIOUS PARAMETERS 69
4.8 SUMMARY AND CONCLUSIONS 72
5 SURFACE NITROGEN ABUNDANCES FOR O-STARS IN THE LARGE MAGELLANIC CLOUD
75 5.1 INTRODUCTION 76
5.2 UNDERSTANDING THE N IV A4058/A6380 LINE FORMATION 77
5.3 STELLAR SAMPLE AND OBSERVATIONS 83
5.3.1 THE STELLAR SAMPLE 83
5.3.2 OBSERVATIONS 85
5.4 ANALYSIS 85
5.4.1 METHODOLOGY 85
5.4.2 MODEL CALCULATIONS AND GRIDS 86
5.4.3 DETERMINATION O F STELLAR AND WIND PARAMETERS 88
5.4.4 NITROGEN ABUNDANCES AND MICRO-TURBULENCES 91
5.4.5 ADDITIONAL CONSIDERATIONS 93
5.5 COMMENTS ON THE INDIVIDUAL OBJECTS 94
5.5.1 LATE O-AND B-SUPERGIANTS/GIANTS 95
5.5.2 O-STARS 96
5.6 DISCUSSION 103
5.6.1 COMPARISON WITH RESULTS FROM MOK07 103
5.6.2 OVERLAP WITH B-STAR NITROGEN ANALYSES 104
5.6.3 NITROGEN ABUNDANCES 105
5.7 SUMMARY 107
6 THE EARLIEST O-STARS 109
6.1 INTRODUCTION 110
6.2 CODE AND MODEL GRID I L L
6.3 N M/N IV EMISSION LINES - PARAMETER-DEPENDENCE 112
6.3.1 N III EMISSION LINE FORMATION: EUV LINE-BLOCKING VS. WIND-STRENGTH
112
IMAGE 3
CONTENTS IX
6.3.2 NIVA4058 - DEPENDENCE ON BACKGROUND ABUNDANCE 115
6.3.3 NIVA4058 - DEPENDENCE ON NITROGEN ABUNDANCE 117
6.4 PREDICTIONS ON THE N IV/N III EMISSION LINE RATIO 118
6.4.1 OVERVIEW 118
6.4.2 BASIC CONSIDERATIONS 120
6.5 COMPARISON WITH RESULTS FROM CMFGEN 124
6.6 ANALYSIS OF A SAMPLE O F LMC/SMC EARLY-TYPE O-STARS 130
6.6.1 THE STELLAR SAMPLE 130
6.6.2 OBSERVATIONAL DATA 130
6.6.3 ANALYSIS 132
6.6.4 COMMENTS ON THE INDIVIDUAL OBJECTS 134
6.6.5 COMPARISON WITH RESULTS FROM MASSEY ET AL 137
6.7 DISCUSSION 138
6.7.1 NITROGEN ABUNDANCES 138
6.7.2 EFFECTIVE TEMPERATURES VS. SPECTRAL TYPES 138
6.7.3 N IV/N ILL EMISSION LINE RATIO 142
6.7.4 N V/N IV LINE RATIO 144
6.7.5 CAVEATS FOR LOW-METALLICITY STARS 146
6.7.6 SMC OF-STARS 147
6.8 SUMMARY AND CONCLUSIONS 148
7 SUMMARY AND OUTLOOK 152
7.1 SUMMARY 152
7.2 OUTLOOK 156
A TESTING THE NII MODEL ION 159
B COMPARISON OF LINE PROFILES WITH RESULTS FROM CMFGEN 165
B. 1 COMPARISON O F N IL/N ILL LINE PROFILES 165
B.2 COMPARISON OF H/HE/N LINE PROFILES FOR MODELS WITH DIFFERENT
NITROGEN ABUNDANCES . 172
C LINE FITS FOR INDIVIDUAL OBJECTS 179
C.L LINE FITS FOR THE LMC SAMPLE 179
C.2 LINE FITS FOR THE LMC/SMC EARLY O-STAR SAMPLE 190
BIBLIOGRAPHY 203
ACKNOWLEDGEMENTS 221
CURRICULUM VITAE 223
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| author_facet | Rivero González, Jorge Gustavo |
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| illustrated | Not Illustrated |
| indexdate | 2024-07-10T00:31:40Z |
| institution | BVB |
| language | English |
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| oclc_num | 864012534 |
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| physical | 220 S. graph. Darst. |
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| spelling | Rivero González, Jorge Gustavo Verfasser aut Nitrogen line spectroscopy in O-stars Jorge Gustavo Rivero González 2012 220 S. graph. Darst. txt rdacontent c rdamedia cr rdacarrier München, Univ., Diss., 2012 (DE-588)4113937-9 Hochschulschrift gnd-content http://edoc.ub.uni-muenchen.de/14899/ Verlag kostenfrei Volltext http://d-nb.info/1027066267/34 Langzeitarchivierung Nationalbibliothek https://nbn-resolving.org/urn:nbn:de:bvb:19-148998 Resolving-System DNB Datenaustausch application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=025666718&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | Rivero González, Jorge Gustavo Nitrogen line spectroscopy in O-stars |
| subject_GND | (DE-588)4113937-9 |
| title | Nitrogen line spectroscopy in O-stars |
| title_auth | Nitrogen line spectroscopy in O-stars |
| title_exact_search | Nitrogen line spectroscopy in O-stars |
| title_full | Nitrogen line spectroscopy in O-stars Jorge Gustavo Rivero González |
| title_fullStr | Nitrogen line spectroscopy in O-stars Jorge Gustavo Rivero González |
| title_full_unstemmed | Nitrogen line spectroscopy in O-stars Jorge Gustavo Rivero González |
| title_short | Nitrogen line spectroscopy in O-stars |
| title_sort | nitrogen line spectroscopy in o stars |
| topic_facet | Hochschulschrift |
| url | http://edoc.ub.uni-muenchen.de/14899/ http://d-nb.info/1027066267/34 https://nbn-resolving.org/urn:nbn:de:bvb:19-148998 http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=025666718&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA |
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